Roska, A., and A. Jaunzeme. “VIENOTAS VIDES AIZSARDZĪBAS VADĪBAS SISTĒMAS IZVEIDE”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 20, 1999): 166–170. Accessed May 6, 2024. https://journals.ru.lv/index.php/ETR/article/view/1881.